package com.lin.gulimall.cart.interceptor;


import com.lin.common.constant.AuthServerConstant;
import com.lin.common.constant.CartServiceConstant;
import com.lin.common.vo.MemberResVo;
import com.lin.gulimall.cart.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;


/*
 * 在执行目标方法之前，判断用户的登陆状态，并封装传递给controller目标请求
 * 拦截器
 */

//@Component
public class CartInterreceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();

        HttpSession session = request.getSession();
        MemberResVo member = (MemberResVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (member!=null){
            //用户登陆
            userInfoTo.setUserId(member.getId());
        }

        Cookie[] cookies = request.getCookies();
        if (cookies!=null && cookies.length>0){
            for (Cookie cookie : cookies) {
                //user-key
                String name = cookie.getName();
                if (name.equals(CartServiceConstant.TEMP_USER_COOKIE_NAME));
                userInfoTo.setUserKey(cookie.getValue());
                userInfoTo.setTempUser(true);
            }
        }
        //如果没有临时用户，一定分配一个临时用户。
        if (StringUtils.hasText(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        //目前方法执行之前，
        threadLocal.set(userInfoTo);
        return true;
    }

    /*
    * 业务执行之后
    *
    */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();

        if (!userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartServiceConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartServiceConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
        //持续的延长临时用户的过期时间

    }
}
